Bubble formation and rising dynamics analises
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2015-11-06
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Jaén : Universidad de Jaén
Resumen
[ES] El principal propósito de esta Tesis consiste en contribuir a mejorar el conocimiento acerca del comportamiento dinámico de las burbujas y el desarrollo de herramientas apropiadas que permitan el estudio y descripción del fenómeno de formación y consiguiente movimiento ascendente bajo diferentes premisas. En este sentido, el estudio está focalizado en la generación de burbujas bajo condiciones de inyección intermedias, es decir, condiciones donde ni el caudal, ni la presión de alimentación permanecen constantes durante el proceso de inyección . Adicionalmente, se analiza numéricamente el movimiento de ascenso de la burbuja, caracterizando la forma, trayectoria y estela de la misma como función de las propiedades del fluido y el tamaño de la burbuja. Así, se establece la curva neutra que define la transición desde un movimiento estable a inestable, por medio de análisis de estabilidad lineal y simulaciones numéricas directas.
[EN]The main purpose of this dissertation is to contribute to improve the knowledge of the bubble dynamics behavior and to develop appropriate tools to allow the study and description of the bubble formation phenomenon and its subsequent ascending motion under different situations . In this sense , the study has been focused on the generation of bubbles under intermediate injection conditions , i.e. conditions where neither the gas flow rate nor the feeding pressure remain constant during the bubble formation process. Additionally, the bubble ascension motion has been analyzed numerically, characterizing the bubble shape, path and wake as functions of the fluids properties and bubble size. Thus, the neutral curve that defines the transition from a stable to an unstable ascending motion has been established by means of Linear Stability Analysis and Direct Numerical Simulations
[EN]The main purpose of this dissertation is to contribute to improve the knowledge of the bubble dynamics behavior and to develop appropriate tools to allow the study and description of the bubble formation phenomenon and its subsequent ascending motion under different situations . In this sense , the study has been focused on the generation of bubbles under intermediate injection conditions , i.e. conditions where neither the gas flow rate nor the feeding pressure remain constant during the bubble formation process. Additionally, the bubble ascension motion has been analyzed numerically, characterizing the bubble shape, path and wake as functions of the fluids properties and bubble size. Thus, the neutral curve that defines the transition from a stable to an unstable ascending motion has been established by means of Linear Stability Analysis and Direct Numerical Simulations
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Palabras clave
Formación de burbujas, Paradoja de Leonardo, Ascensión de burbujas, Estabilidad de estelas, Bubble formation, Leonardo's paradox, Bubble rising, Bubble shape, Stability wake
Citación
Cano-Lozano, José-Carlos. Bubble formation and rising dynamics analises. 2015, 140 p. [http://hdl.handle.net/10953/714]